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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 297 (Lighting System) >> Diagnostic Information and Procedures >> Courtesy Lamps Malfunction >> Circuit/System Verification

Circuit/System Verification

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  1. Ignition ON, observe the scan tool Door Ajar Sw. parameter while opening and closing each vehicle door. The parameter should change between Door Ajar and Door Closed.
  2. Observe the scan tool Rear Closure Ajar Sw. parameter while opening and closing the trunk. The parameter should change between Active and Inactive.
  3. Command the Courtesy Lamps ON and OFF with a scan tool. The courtesy lamps should turn ON and OFF when changing between the commanded states.
    • If the courtesy lamps do not turn ON and OFF when commanded, refer to Courtesy Lamp Malfunction below.
  4. All doors closed, observe the scan tool Ctsy. Lamp Actv. Reason parameter while turning the dome lamp switch ON and OFF. The reading should change between Off and Manual.
    • If the Ctsy. Lamp Actv. Reason parameter does not change between Off and Manual, refer to Dome/Interior Lamp Switch Malfunction below.
  5. All doors closed, observe the scan tool Ctsy. Lamp Actv. Reason parameter while turning the interior lamp defeat switch ON and OFF. The reading should change between Off and Manual Defeat.
    • If the Ctsy. Lamp Actv. Reason parameter does not change between Off and Manual, refer to Dome/Interior Lamp Switch Malfunction below.
  6. Turn the individual reading lamps ON and OFF with their respective switches. The reading lamps should turn ON and OFF when changing between the selected states.
    • If any reading lamp does not turn ON and OFF when selected, refer to Reading Lamps Malfunction below.
  7. Turn the left and right vanity mirror lamps ON and OFF with their respective switches. The vanity mirror lamps should turn ON and OFF when changing between the selected states.
    • If any reading lamp does not turn ON and OFF when selected, refer to Vanity Mirror Lighting Malfunction below.
  8. Command the Courtesy Lamp ON and OFF with a scan tool. Verify the exterior illumination lamps turn ON and OFF.
    • If the exterior illumination lamps do not change between ON and OFF, refer to Outside Rearview Mirror Illumination Malfunction below.
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